1. Physical and Chemical Changes

2. Matter Anything that has mass and takes up space (has volume). Matter
Pure Substances
Elements
e.g. carbon
Compounds
e.g. CO2, H2O
Mixtures
Solutions
e.g. salt water
Mechanical
e.g. pizza

3. Matter Can be described as
Physical property – description of substance. Ie. Colour, smell, taste, density.
Chemical property – Describes how a substance reacts when mixed with other substances. ie. Gas burns in heat and oxygen.

4. Physical Change A change that does not produce a new substance.
Usually reversible
e.g. melting ice, dissolving salt

5. Chemical Change A reaction takes place creating a new substance.
Usually hard or impossible to reverse.
Ex. Cooking an egg

6. There are 5 clues that a chemical change may have occurred…
1. A new colour appears.

7. 2. Heat or Light is given off.

8. 3. Bubbles of Gas are formed.

9. 4. A new solid material forms (precipitate).

10. 5. A new odour is made.

11. What do you think? 1. Sugar dissolving in tea?
2. Breaking water up into hydrogen and oxygen gas?
3. Burning a log in a campfire?
4. Crushing an Aspirin?
5. Metal Rusting?
6. Lighter fluid burning?
7. An egg rotting?
8. Boiling water?
9. Test tubes in picture  ?